/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
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 */
package org.apache.iotdb.confignode.it.load;

import org.apache.iotdb.common.rpc.thrift.TSStatus;
import org.apache.iotdb.common.rpc.thrift.TSeriesPartitionSlot;
import org.apache.iotdb.common.rpc.thrift.TTimePartitionSlot;
import org.apache.iotdb.commons.client.sync.SyncConfigNodeIServiceClient;
import org.apache.iotdb.confignode.it.utils.ConfigNodeTestUtils;
import org.apache.iotdb.confignode.rpc.thrift.*;
import org.apache.iotdb.consensus.ConsensusFactory;
import org.apache.iotdb.it.env.ConfigFactory;
import org.apache.iotdb.it.env.EnvFactory;
import org.apache.iotdb.it.framework.IoTDBTestRunner;
import org.apache.iotdb.itbase.category.ClusterIT;
import org.apache.iotdb.rpc.TSStatusCode;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@RunWith(IoTDBTestRunner.class)
@Category({ClusterIT.class})
public class IoTDBConfigNodeSwitchLeaderIT {

    protected static String originalConfigNodeConsensusProtocolClass;
    protected static String originalSchemaRegionConsensusProtocolClass;
    protected static String originalDataRegionConsensusProtocolClass;

    protected static int originalSchemaReplicationFactor;
    protected static int originalDataReplicationFactor;
    private static final int testReplicationFactor = 3;

    private static final int testConfigNodeNum = 3;
    private static final int testDataNodeNum = 3;

    private static int configNodeRegionRatisRPCLeaderElectionTimeoutMaxMs;

    @Before
    public void setUp() throws Exception {
        originalConfigNodeConsensusProtocolClass =
                ConfigFactory.getConfig().getConfigNodeConsensusProtocolClass();
        originalSchemaRegionConsensusProtocolClass =
                ConfigFactory.getConfig().getSchemaRegionConsensusProtocolClass();
        originalDataRegionConsensusProtocolClass =
                ConfigFactory.getConfig().getDataRegionConsensusProtocolClass();
        ConfigFactory.getConfig().setConfigNodeConsesusProtocolClass(ConsensusFactory.RATIS_CONSENSUS);
        ConfigFactory.getConfig()
                .setSchemaRegionConsensusProtocolClass(ConsensusFactory.RATIS_CONSENSUS);
        ConfigFactory.getConfig().setDataRegionConsensusProtocolClass(ConsensusFactory.IOT_CONSENSUS);

        originalSchemaReplicationFactor = ConfigFactory.getConfig().getSchemaReplicationFactor();
        originalDataReplicationFactor = ConfigFactory.getConfig().getDataReplicationFactor();
        ConfigFactory.getConfig().setSchemaReplicationFactor(testReplicationFactor);
        ConfigFactory.getConfig().setDataReplicationFactor(testReplicationFactor);

        configNodeRegionRatisRPCLeaderElectionTimeoutMaxMs =
                ConfigFactory.getConfig().getConfigNodeRegionRatisRPCLeaderElectionTimeoutMaxMs();

        // Init 3C3D cluster environment
        EnvFactory.getEnv().initClusterEnvironment(testConfigNodeNum, testDataNodeNum);
    }

    @After
    public void tearDown() {
        EnvFactory.getEnv().cleanAfterClass();

        ConfigFactory.getConfig()
                .setConfigNodeConsesusProtocolClass(originalConfigNodeConsensusProtocolClass);
        ConfigFactory.getConfig()
                .setSchemaRegionConsensusProtocolClass(originalSchemaRegionConsensusProtocolClass);
        ConfigFactory.getConfig()
                .setDataRegionConsensusProtocolClass(originalDataRegionConsensusProtocolClass);

        ConfigFactory.getConfig().setSchemaReplicationFactor(originalSchemaReplicationFactor);
        ConfigFactory.getConfig().setDataReplicationFactor(originalDataReplicationFactor);
    }

    private void switchLeader() throws IOException, InterruptedException {
        // The ConfigNode-Group will elect a new leader after the current ConfigNode-Leader is shutdown
        EnvFactory.getEnv().shutdownConfigNode(EnvFactory.getEnv().getLeaderConfigNodeIndex());
        // Waiting for leader election
        TimeUnit.MILLISECONDS.sleep(configNodeRegionRatisRPCLeaderElectionTimeoutMaxMs);
    }

    @Test
    public void basicDataInheritIT() throws Exception {
        final String sg0 = "root.sg0";
        final String sg1 = "root.sg1";
        final String d00 = sg0 + ".d0.s";
        final String d01 = sg0 + ".d1.s";
        final String d10 = sg1 + ".d0.s";
        final String d11 = sg1 + ".d1.s";

        TSStatus status;
        TSchemaPartitionTableResp schemaPartitionTableResp0;
        TDataPartitionTableResp dataPartitionTableResp0;

        try (SyncConfigNodeIServiceClient client =
                     (SyncConfigNodeIServiceClient) EnvFactory.getEnv().getLeaderConfigNodeConnection()) {
            // Set StorageGroups
            status = client.setStorageGroup(new TSetStorageGroupReq(new TStorageGroupSchema(sg0)));
            Assert.assertEquals(TSStatusCode.SUCCESS_STATUS.getStatusCode(), status.getCode());
            status = client.setStorageGroup(new TSetStorageGroupReq(new TStorageGroupSchema(sg1)));
            Assert.assertEquals(TSStatusCode.SUCCESS_STATUS.getStatusCode(), status.getCode());

            // Create SchemaRegionGroups through getOrCreateSchemaPartition and record
            // SchemaPartitionTable
            ByteBuffer buffer =
                    ConfigNodeTestUtils.generatePatternTreeBuffer(new String[]{d00, d01, d10, d11});
            schemaPartitionTableResp0 =
                    client.getOrCreateSchemaPartitionTable(
                            new TSchemaPartitionReq().setPathPatternTree(buffer));
            Assert.assertEquals(
                    TSStatusCode.SUCCESS_STATUS.getStatusCode(),
                    schemaPartitionTableResp0.getStatus().getCode());

            // Create DataRegionGroups through getOrCreateDataPartition and record DataPartitionTable
            Map<TSeriesPartitionSlot, TTimeSlotList> seriesSlotMap = new HashMap<>();
            seriesSlotMap.put(
                    new TSeriesPartitionSlot(1),
                    new TTimeSlotList()
                            .setTimePartitionSlots(Collections.singletonList(new TTimePartitionSlot(100))));
            Map<String, Map<TSeriesPartitionSlot, TTimeSlotList>> sgSlotsMap = new HashMap<>();
            sgSlotsMap.put(sg0, seriesSlotMap);
            sgSlotsMap.put(sg1, seriesSlotMap);
            dataPartitionTableResp0 =
                    client.getOrCreateDataPartitionTable(new TDataPartitionReq(sgSlotsMap));
            Assert.assertEquals(
                    TSStatusCode.SUCCESS_STATUS.getStatusCode(),
                    dataPartitionTableResp0.getStatus().getCode());
        }

        // Switch the current ConfigNode-Leader
        switchLeader();

        try (SyncConfigNodeIServiceClient client =
                     (SyncConfigNodeIServiceClient) EnvFactory.getEnv().getLeaderConfigNodeConnection()) {
            // Check SchemaPartitionTable
            ByteBuffer buffer =
                    ConfigNodeTestUtils.generatePatternTreeBuffer(new String[]{d00, d01, d10, d11});
            Assert.assertEquals(
                    schemaPartitionTableResp0,
                    client.getSchemaPartitionTable(new TSchemaPartitionReq().setPathPatternTree(buffer)));

            // Check DataPartitionTable
            Map<TSeriesPartitionSlot, TTimeSlotList> seriesSlotMap = new HashMap<>();
            seriesSlotMap.put(
                    new TSeriesPartitionSlot(1),
                    new TTimeSlotList()
                            .setTimePartitionSlots(Collections.singletonList(new TTimePartitionSlot(100))));
            Map<String, Map<TSeriesPartitionSlot, TTimeSlotList>> sgSlotsMap = new HashMap<>();
            sgSlotsMap.put(sg0, seriesSlotMap);
            sgSlotsMap.put(sg1, seriesSlotMap);
            Assert.assertEquals(
                    dataPartitionTableResp0, client.getDataPartitionTable(new TDataPartitionReq(sgSlotsMap)));
        }
    }
}
